I wouldn't frog it, though, since you don't think you'll use it for anything else. It's more usable at this point as a completed shawl, which by the way, is gorgeous!!!

The yarn is gorgeous, however, I know whatcha mean! I've been in a similar situation. I didn't frog the sweater. I wore it a couple time, but was never elated with how the colorway worked out. I thought it would be more dark blue/and/azure blue...but instead, the tans were more dominant. Oy!